Steam-boiler furnace.



PATENTED MAR. 8, 1908.

W. P. DARLING. STEAM BOILER FURNACE.

APPLICATION FILED APR. 22.1907.

WILLIAM. PETER DARLING, 0F MEADVILLE, MISSOURI.

STEAM-BOILER FURNACE;

. Specification of Letters Patent.

Patented March 3, 1908.

Application filed April 22, 1907. Serial No. 369,534.

To all whom it may concern.-

Be it known that I, -WILLIAM PETER DAR- LING, a citizen of the UnitedStates, residing at Meadville, in the county of Linn'and State ofMissouri, have invented certain new and useful Improvements inSteam-Boiler Furnaces, of which the following is a specifica,

tion.

This invention relates to steam-boiler furnaces and has for its objectto provide improved means for feeding air into the furnace above the bedof fuel to promote combustion.

The; invention is more particularly designed for locomotive boilers inwhich the draft is from below the grate. In this type of boilers when"the fuel bed is thick there is a great waste of fuel from the lack ofair as more carbon is liberated from the fuel than there is oxygen totake care of. This causes the unconsumed carbon to pass into the outerair which results in soot and smoke and consequently a waste of fuel.

By the present invention highly heated jets of air are fed into thefurnace above the fuel to complete the combustion of carbon that wouldotherwise go to waste.

In the accompanying drawing, Figure 1 is' a longitudinal sectional viewshowing the application of the invention. Fig. .2 is a modified form ofairtube. Fig. 3 is a transverse section of one of the supportingbrackets of the air tubes.

Referring specifically to the drawing, 5 denotes the fire box of alocomotive type'of boiler. At 6 are indicated flues which pass throughthe Water and steam space of the boiler being expanded and bedded in thetop and crown sheets of the boiler in the ordinary manner of settingboiler flues. The air tubes 7 enter the firebox through the fines 6, oneend of the tubes opening into the outer air and the other into thefire-box a suitable distance above the fuel.

' In the modified form of air tube shown in Fig. 2, the inner end of thetube is closed and the air is discharged through perforations S in thetube.

similarly shaped openings 11 in which saidflared ends snugly seat. Thebrackets are also recessed as indicated at 12 to receive the Eitherstyle of air tube is to beused as 1n practice may prove most effective.

expanded. ends of the Hues 6. Each air tube is provided with a damper 13for controlling the draft. The dampers fit over the open outer ends ofthe air tubes and are slidably mounted in guide\\'a vs 14 on top of thebrackets. The dampers are connected'to an operating rod 15 so thattheymay be simultaneously operated.

The air tubes 7 are spaced from the inside of the flues 6 which allowsthe heat from the furnace to enter the ilues and surround the air tubesso that the air which passes into the lire-box through said tubes ishighly heated before reaching the fuel. The air space around the airtubes also protects the fines 6 from sudden contraction and expanareshown but a greater or less number may I be used as practice may deemnecessary for the-size of the fire-box used, the object be ing to obtainas good a distribution of the heated air as possible. r

The apparatus'herein described .is a fuel economizer and practicallyeliminates smoke. It can be readily applied to old and new boilersandadds but little weight thereto. The manner in which the air tubes aremounted permits their ready removal for cleaning and also for cleaningthe flues 6.

I claim 1. The combination with the fire-box and the crown and topsheets of a boiler, of fines mounted in the crown and top sheets, and

closed at their outer ends, and air-feeding pipes entering the fire-boxthrough said fines, and spaced from theinside thereof.

2. The combination with the fire-box and the crown and top sheets of aboiler, of flues mounted in the crown and top she'ets,

brackets fastened to the top sheet over the outer ends of the lines,air-feeding pipes mounted in said brackets and entering the the crownendtop sheets of a boiler, of fines outerends of'the fines, andair-feeding pipes 1 fire-box t'l lrough the fines, means for exhavingflaring endsseating in the-recesses 1 eluding air from the fiues, anddampers for of the brackets and closing the outer ends of the air-pipesmounted on the brackets.

the fines to excludeoutside air therefrom. a t I L The Combination withthe fire-box and in presence of two witnesses.

WILLIAM PETER DARLING;

Witnesses:

SInAs- E. TIPTON, JonN BILLINGTON.

brackets fastened to the top sheet over the outer :ends of' the fiuesalvfeeding ipes mounted inthe crown and top sheets,

mounted in 'saidbraekets and entering the In testimony whereof I aflixlnysignature,

